Just a great place, with the Crestones looming above. I liked climbing the steepest part of High Dune, it felt like I was going nowhere with every step but I eventually got there. Then run back down!!!
Did it early in the morning and had wonderful light for photography! But, it is harder than it looks, both because of the altitude (over 8,000 feet), and because the sand made hiking so difficult. Well worth the view from the top, however! You'll see parts of the park that can't be seen from anywhere along the main roads.